/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.mishow.zxing.decoding;

import java.util.Hashtable;
import java.util.Vector;
import java.util.concurrent.CountDownLatch;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.ResultPointCallback;
import com.mishow.zxing.activity.CaptureActivity;

import android.os.Handler;
import android.os.Looper;

/**
 * This thread does all the heavy lifting of decoding the images. �����߳�
 */
final class DecodeThread extends Thread {
	
	public static final String BARCODE_BITMAP = "barcode_bitmap";
	private final CaptureActivity activity;
	private final Hashtable<DecodeHintType, Object> hints;
	private Handler handler;
	private final CountDownLatch handlerInitLatch;
	
	DecodeThread(CaptureActivity activity, Vector<BarcodeFormat> decodeFormats, String characterSet, ResultPointCallback resultPointCallback) {
		
		this.activity = activity;
		handlerInitLatch = new CountDownLatch(1);
		
		hints = new Hashtable<DecodeHintType, Object>(3);
		
		if (decodeFormats == null || decodeFormats.isEmpty()) {
			decodeFormats = new Vector<BarcodeFormat>();
			decodeFormats.addAll(DecodeFormatManager.ONE_D_FORMATS);
			decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
			decodeFormats.addAll(DecodeFormatManager.DATA_MATRIX_FORMATS);
		}
		
		hints.put(DecodeHintType.POSSIBLE_FORMATS, decodeFormats);
		
		if (characterSet != null) {
			hints.put(DecodeHintType.CHARACTER_SET, characterSet);
		}
		
		hints.put(DecodeHintType.NEED_RESULT_POINT_CALLBACK, resultPointCallback);
	}
	
	Handler getHandler() {
		try {
			handlerInitLatch.await();
		} catch (InterruptedException ie) {
			// continue?
		}
		return handler;
	}
	
	@Override
	public void run() {
		Looper.prepare();
		handler = new DecodeHandler(activity, hints);
		handlerInitLatch.countDown();
		Looper.loop();
	}
	
}
